Did you know that fall is the perfect time to treat for spring weeds? Summer herbicide applications have likely burned down top growth, but weeds will reappear once air and soil temperatures start to drop. With warm days and cool nights, weeds begin to store energy and send it to the crown and roots — and the herbicide moves with it, making it an ideal time for application. Many annuals and perennial weeds will be present on golf courses and turfgrasses during this time, giving you the perfect opportunity to attack a broad spectrum of weeds. Follow these handy steps to create a fall weed control plan:
Don’t waste time and money trying to control the wrong weeds. It’s important to know your offenders ahead of time. Here are some weeds you can target with a fall application:
Identify the places where you’ve had difficulties controlling weeds in the past. The growth stage of the plants in these problem spots will indicate when in the fall you should start your broadleaf weed control program.
If you make your application prior to germination, you’ll want to use a preemergence herbicide, such as Dimension® or Gallery® specialty herbicide. Gallery prevents broadleaf weeds that germinate in the fall, winter and spring. Dimension controls crabgrass and other grassy weeds.
In the North, golf course superintendents (GCS) can make preemergence applications as early as Labor Day. In warmer climates, GCSs can apply as late as October. If you are targeting perennials or weeds that have already germinated, try Defendor® specialty herbicide, a postemergence herbicide that works at preemergence timing. When applied in late fall or early spring, it will eliminate plant growth and prevent bloom.
This step gives you your application window for the most effective control. Preemergence herbicides should be applied two weeks prior to weed seed germination. If you are using a postemergence herbicide, such as Defendor, you can make applications into late November.
State restrictions on the sale and use of Defendor and Dimension specialty herbicide products apply. Consult the label before purchase or use for full details. Always read and follow label directions.
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Effective weed control starts with identification. Learn to identify 90+ grassy and broadleaf weeds.